diff --git a/packages/frontend/src/components/MkPushNotificationAllowButton.vue b/packages/frontend/src/components/MkPushNotificationAllowButton.vue
index 9c37eb5e72..c651d3a3f5 100644
--- a/packages/frontend/src/components/MkPushNotificationAllowButton.vue
+++ b/packages/frontend/src/components/MkPushNotificationAllowButton.vue
@@ -78,7 +78,7 @@ function subscribe() {
 	// SEE: https://developer.mozilla.org/en-US/docs/Web/API/PushManager/subscribe#Parameters
 	return promiseDialog(registration.value.pushManager.subscribe({
 		userVisibleOnly: true,
-		applicationServerKey: urlBase64ToUint8Array(instance.swPublickey),
+		applicationServerKey: urlBase64ToBase64(instance.swPublickey),
 	})
 		.then(async subscription => {
 			pushSubscription.value = subscription;
@@ -131,22 +131,16 @@ function encode(buffer: ArrayBuffer | null) {
 }
 
 /**
- * Convert the URL safe base64 string to a Uint8Array
+ * Convert the URL safe base64 string to a base64 string
  * @param base64String base64 string
  */
-function urlBase64ToUint8Array(base64String: string): Uint8Array {
+function urlBase64ToBase64(base64String: string): string {
 	const padding = '='.repeat((4 - base64String.length % 4) % 4);
 	const base64 = (base64String + padding)
 		.replace(/-/g, '+')
 		.replace(/_/g, '/');
 
-	const rawData = window.atob(base64);
-	const outputArray = new Uint8Array(rawData.length);
-
-	for (let i = 0; i < rawData.length; ++i) {
-		outputArray[i] = rawData.charCodeAt(i);
-	}
-	return outputArray;
+	return base64;
 }
 
 if (navigator.serviceWorker == null) {
diff --git a/packages/frontend/src/components/global/MkAvatar.vue b/packages/frontend/src/components/global/MkAvatar.vue
index 8a9cc5286a..c2548cc7be 100644
--- a/packages/frontend/src/components/global/MkAvatar.vue
+++ b/packages/frontend/src/components/global/MkAvatar.vue
@@ -84,7 +84,6 @@ const bound = computed(() => props.link
 	: {});
 
 const url = computed(() => {
-	if (props.user.avatarUrl == null) return null;
 	if (prefer.s.disableShowingAnimatedImages || prefer.s.dataSaver.avatar) return getStaticImageUrl(props.user.avatarUrl);
 	return props.user.avatarUrl;
 });
diff --git a/packages/frontend/src/components/global/RouterView.vue b/packages/frontend/src/components/global/RouterView.vue
index 3a508eaca0..d42beb531d 100644
--- a/packages/frontend/src/components/global/RouterView.vue
+++ b/packages/frontend/src/components/global/RouterView.vue
@@ -54,14 +54,10 @@ router.useListener('change', ({ resolved }) => {
 	if (resolved == null || 'redirect' in resolved.route) return;
 	if (resolved.route.path === currentRoutePath && deepEqual(resolved.props, currentPageProps.value)) return;
 
-	function _() {
-		currentPageComponent.value = resolved.route.component;
-		currentPageProps.value = resolved.props;
-		key.value = router.getCurrentFullPath();
-		currentRoutePath = resolved.route.path;
-	}
-
-	_();
+	currentPageComponent.value = resolved.route.component;
+	currentPageProps.value = resolved.props;
+	key.value = router.getCurrentFullPath();
+	currentRoutePath = resolved.route.path;
 });
 </script>
 
diff --git a/packages/frontend/src/pages/admin/modlog.vue b/packages/frontend/src/pages/admin/modlog.vue
index b7e5d6b219..08bdc8d254 100644
--- a/packages/frontend/src/pages/admin/modlog.vue
+++ b/packages/frontend/src/pages/admin/modlog.vue
@@ -78,7 +78,7 @@ const timeline = computed(() => {
 	return paginator.items.value.map(x => ({
 		id: x.id,
 		timestamp: new Date(x.createdAt).getTime(),
-		data: x,
+		data: x as Misskey.entities.ModerationLog,
 	}));
 });
 
diff --git a/packages/frontend/src/pages/settings/webhook.new.vue b/packages/frontend/src/pages/settings/webhook.new.vue
index 6c4dff5551..5f36e6bcfc 100644
--- a/packages/frontend/src/pages/settings/webhook.new.vue
+++ b/packages/frontend/src/pages/settings/webhook.new.vue
@@ -40,6 +40,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { ref, computed } from 'vue';
+import * as Misskey from 'misskey-js';
 import MkInput from '@/components/MkInput.vue';
 import FormSection from '@/components/form/section.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
@@ -61,7 +62,7 @@ const event_reaction = ref(true);
 const event_mention = ref(true);
 
 async function create(): Promise<void> {
-	const events: string[] = [];
+	const events = [] as Misskey.entities.UserWebhook['on'];
 	if (event_follow.value) events.push('follow');
 	if (event_followed.value) events.push('followed');
 	if (event_note.value) events.push('note');
diff --git a/packages/frontend/src/preferences/manager.ts b/packages/frontend/src/preferences/manager.ts
index 9157ba05d4..d26d590851 100644
--- a/packages/frontend/src/preferences/manager.ts
+++ b/packages/frontend/src/preferences/manager.ts
@@ -469,6 +469,8 @@ export class PreferencesManager {
 				return local;
 			} else if (choice === 'merge') {
 				return mergedValue!;
+			} else { // TSを黙らすため
+				return undefined;
 			}
 		}
 
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index 6f609af906..88b806ed07 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -49,7 +49,7 @@ export type ModerationLog = {
 	id: ID;
 	createdAt: DateString;
 	userId: User['id'];
-	user: UserDetailedNotMe | null;
+	user: UserDetailedNotMe;
 } & ({
 	type: 'updateServerSettings';
 	info: ModerationLogPayloads['updateServerSettings'];